<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>分类参数</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图区域 -->
    <el-card>
      <el-alert title="注意：只允许为第三季分类设置相关参数！" type="warning" style="margin-bottom: 15px" :closable="false" show-icon></el-alert>
      <el-row>
        <el-col>
          <span>选择商品分类：</span>
          <div class="block">
            <el-cascader v-model="selectedKeys" :options="cateList" :props="cateProps" @change="handleChange"></el-cascader>
          </div>
        </el-col>
      </el-row>
      <!-- tab 页签区域 -->
      <el-tabs v-model="activeName" @tab-click="handleTabsClick">
        <el-tab-pane label="动态参数" name="many">
          <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true">添加参数</el-button>
          <!-- 动态参数表格 -->
          <el-table :data="manyTableData" border stripe>
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环渲染tag标签 -->
                <el-tag v-for="(item, index) in scope.row.attr_vals" :key="index" closable @close="tagClose(index, scope.row)">{{ item }}</el-tag>
                <!-- 输入文本框 -->
                <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue" ref="saveTagInput" size="small" @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)">
                </el-input>
                <!-- 添加按钮 -->
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <el-table-column type="index"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button type="primary" size="mini" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                <el-button type="danger" size="mini" icon="el-icon-delete" @click="delParams(scope.row.attr_id)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <el-tab-pane label="静态属性" name="only">
          <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true">添加属性</el-button>
          <!-- 静态属性表格 -->
          <el-table :data="onlyTableData" border stripe>
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环渲染tag标签 -->
                <el-tag v-for="(item, index) in scope.row.attr_vals" :key="index" closable @close="tagClose(index, scope.row)">{{ item }}</el-tag>
                <!-- 输入文本框 -->
                <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue" ref="saveTagInput" size="small" @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)">
                </el-input>
                <!-- 添加按钮 -->
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <el-table-column type="index"></el-table-column>
            <el-table-column label="属性名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button type="primary" size="mini" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                <el-button type="danger" size="mini" icon="el-icon-delete" @click="delParams(scope.row.attr_id)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>

    <!-- 添加参数的对话框 -->
    <el-dialog :title="'添加' + titleText" :visible.sync="addDialogVisible" width="50%" @close="addDialogClosed">
      <!-- 添加参数的表格 -->
      <el-form :model="addForm" :rules="formRules" ref="addFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>

    <!-- 修改参数的对话框 -->
    <el-dialog :title="'添加' + titleText" :visible.sync="editDialogVisible" width="50%" @close="editDialogClosed">
      <!-- 修改参数的表格 -->
      <el-form :model="editForm" :rules="formRules" ref="editFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      cateList: [],
      cateProps: {
        expandTrigger: 'hover',
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      },
      selectedKeys: [],
      // 被激活的页签名称
      activeName: 'only',
      // 动态参数的数据
      manyTableData: [],
      // 静态属性的数据
      onlyTableData: [],
      addDialogVisible: false,
      editDialogVisible: false,
      // 表单的数据对象
      addForm: {
        attr_name: ''
      },
      // 修改的表单数据对象
      editForm: {
        attr_name: ''
      },
      // 表单的验证规则
      formRules: {
        attr_name: [{ required: true, message: `请输入参数/属性名称`, trigger: 'blur' }]
      }
    }
  },
  computed: {
    isBtnDisabled() {
      if (this.selectedKeys.length !== 3) return true
      return false
    },
    cateId() {
      if (this.selectedKeys.length === 3) return this.selectedKeys[2]
      return null
    },
    // 动态计算标题的文本
    titleText() {
      if (this.activeName === 'many') return '动态参数'
      else return '静态属性'
    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    async getCateList() {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) return this.$message.error('获取商品分类失败')
      console.log(res.data)
      this.cateList = res.data
    },
    // 级联选择器的值发生改变时触发
    handleChange() {
      this.getParamsData()
    },
    // tab 页签点击事件的处理函数
    handleTabsClick() {
      this.getParamsData()
    },
    // 获取参数数据
    async getParamsData() {
      if (this.selectedKeys.length !== 3) {
        this.selectedKeys = []
        this.manyTableData = []
        this.onlyTableData = []
        return
      }
      // 根据所选分类的id，和当前所处面板，获取对应的参数
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, {
        params: {
          sel: this.activeName
        }
      })
      if (res.meta.status !== 200) return this.$message.error('获取参数列表失败')
      res.data.forEach(item => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
        // 控制文本框的显示与隐藏
        item.inputVisible = false
        // 文本框中输入的值
        item.inputValue = ''
      })
      console.log(res.data)
      if (this.activeName === 'many') {
        this.manyTableData = res.data
      } else {
        this.onlyTableData = res.data
      }
    },
    // 监听对话框的关闭事件
    addDialogClosed() {
      this.$refs.addFormRef.resetFields()
    },
    // 点击按钮添加参数
    addParams() {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.post(`categories/${this.cateId}/attributes`, {
          attr_name: this.addForm.attr_name,
          attr_sel: this.activeName
        })
        if (res.meta.status !== 201) return this.$message.error('添加参数失败')
        this.$message.success('添加参数成功')
        this.addDialogVisible = false
        this.getParamsData()
      })
    },
    // 点击按钮，展示修改的对话框
    async showEditDialog(attrId) {
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes/${attrId}`, {
        attr_sel: this.activeName
      })
      if (res.meta.status !== 200) return this.$message.error('查询参数失败')
      this.editForm = res.data
      this.editDialogVisible = true
    },
    editDialogClosed() {
      console.log('我关闭啦')
      this.$refs.editFormRef.resetFields()
    },
    // 修改对话框的确定按钮
    editParams() {
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`, {
          attr_name: this.editForm.attr_name,
          attr_sel: this.activeName
        })
        if (res.meta.status !== 200) return this.$message.error('修改属性/参数失败')
        this.$message.success('修改参数/属性成功')
        this.editDialogVisible = false
        this.getParamsData()
      })
    },
    // 删除属性/参数的函数方法
    async delParams(attrId) {
      const confirmResult = await this.$confirm('此操作将永久删除该属性/参数，是否继续？', '提示', {
        confirmButtonText: '删除',
        showClose: false,
        closeOnClickModal: false,
        type: 'warning'
      }).catch(err => err)
      if (confirmResult !== 'confirm') return this.$message.info('已取消删除操作')
      // 用户已确认删除
      const { data: res } = await this.$http.delete(`categories/${this.cateId}/attributes/${attrId}`)
      if (res.meta.status !== 200) return this.$message.error('删除操作失败')
      this.$message.success('删除成功！')
      // 刷新列表
      this.getParamsData()
    },
    // 文本框失去焦点和聚焦所触发
    async handleInputConfirm(row) {
      if(row.inputValue.trim().length === 0) {
        row.inputValue = ''
        row.inputVisible = false
        return
      }
      // 所填信息非空的情况
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false
      // 开始发送网络请求
      const {data: res} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,{
        attr_name: row.attr_name,
        attr_sel: row.attr_sel,
        attr_vals: row.attr_vals.join(' ')
      })
      if(res.meta.status !== 200) return this.$message.error('添加参数项失败')
      this.$message.success('添加参数项成功')     
    },
    showInput(row) {
      row.inputVisible = true
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },
    async tagClose(index, row) {
      const confirmResult = await this.$confirm('确定删除此参数？', '提示', {
        confirmButtonText: '删除',
        showClose: false,
        closeOnClickModal: false,
        type: 'warning'
      }).catch(err => err)
      if(confirmResult !== 'confirm') return this.$message.info('已取消删除操作')
      // 以下逻辑为用户已确认删除
      row.attr_vals.splice(index, 1)
      // 开始发送网络请求
      const {data: res} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,{
        attr_name: row.attr_name,
        attr_sel: row.attr_sel,
        attr_vals: row.attr_vals.join(' ')
      })
      if(res.meta.status !== 200) return this.$message.error('删除参数项失败')
      this.$message.success('删除参数项成功')
    }
  }
}
</script>

<style lang="less" scoped>
.el-tag {
  margin: 0 5px;
}
.button-new-tag {
  margin-left: 10px;
  height: 32px;
  line-height: 30px;
  padding-top: 0;
  padding-bottom: 0;
}
.input-new-tag {
  width: 90px;
  margin-left: 10px;
  vertical-align: bottom;
}
</style>